Chapter 2 Mechanical Installation 27
System 2
expansion valve
System 1
System 2
System
2 sight
glass
System 1 pipe
System 1
expansion valve
System
1 sight
glass
System 2
pipe
System
2 sight
glass
System 1 pipe
System 1
expansion valve
System
1 sight
glass
System 2
pipe
Air-cooled of downflow
Water-cooled of downflow
System 2
expansion valve
System 1
System 2
Figure 2-28 Pipe connection of downflow unit
Considering the effect of the pipe diameter on the system pressure drop, the pipe diameter of the indoor unit and
outdoor unit should be determined according to the specifications listed in Table 2-7.
Table 2-7 Recommended pipe sizes
Recommended pipe sizes (unit: mm)
Model
P1020 P1025 P1030 P1035 P2035 P2040 P2045 P2050
Eq.Lgt
h
D L D L D L D L D L D L D L D L
10m 22 13 22 13 22 13 22 13 22 13 22 13 22 13 22 13
20m 22 13 22 13 22 13 22 16 22 16 22 13 22 16 22 13
30m 22 13 22 13 22 16 25 16 25 16 22 13 25 16 22 13
40m*
22 13 22 13 22 16 25 16 25 16 22 13 25 16 22 13
50m*
22 13 22 16 25 16 25 16 25 16 22 13 28 19 22 16
60m*
22 16 22 16 25 16 25 19 25 19 22 16 28 19 22 16
Model
P2055 P2060 P2070 P3070 P3080 P3090 P3100
Eq.Lgt
h
D L D L D L D L D L D L D L
10m 22 16 22 13 22 13 22 13 22 13 22 13 22 16
20m 25 16 22 13 22 16 22 16 22 16 25 16 25 16
30m 28 19 22 16 25 16 25 16 25 16 25 16 28 19
40m*
28 19 22 16 25 16 25 16 25 16 25 16 28 19
50m*
28 19 25 16 25 16 25 16 28 19 28 19 28 19
60m*
32 19 25 16 25 19 25 19 28 19 28 19 32 19
Note
：
1. A pipe extension kit is required for ‘Eq.Lgth’ marked with *.
2. D: discharge line, L: liquid line.
3. Consult Emerson if the pipe length exceeds 60m
z
Connecting water inlet and outlet pipe of the chilled water (dual cooling unit)
The water inlet and outlet pipe of the chilled water is connected to the chilled water unit through welding. The inlet and
outlet pipe of the chilled water should be welded according to the unit rack labelling, do not reverse the connection.
The water inlet and outlet pipe of the chilled water can be connected from the base pallet or side panel, see the cutout
positions schematic diagram of the base pallet and side panel for pipe entry position (see Figure 2-17, Figure 2-18,
Figure 2-20). There should be a flexible connector for water inlet and outlet pipe and unit connection. The water inlet
pipe must be installed with a strainer more than 60 mesh. The water inlet and outlet pipe of the chilled water should be
installed more than one isolation valve, so as to cut off the power upon repair. One of the isolation valves can be a
balancing valve. The chilled water system with a balancing valve has higher efficiency, and can control the water
distribution more accurately.
z
Installing pipe extension kit (for site installation)
When the equivalent length of the one-way pipe exceeds 30m, the pipe extension kit should be installed. During the
installation of the pipe extension kit, to avoid the pipe opening, it is recommended to install the solenoid valve of the
Liebert.PEX2 Series Air Conditioner User Manual
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